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Solids & Liquids

Solids & Liquids. CA Standards. Students know the atoms and molecules in liquids move in a random pattern relative to one another because the intermolecular forces are too weak to hold the atoms or molecules in a solid form . Intermolecular Forces.

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Solids & Liquids

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  1. Solids & Liquids

  2. CA Standards • Students know the atoms and molecules in liquids move in a random pattern relative to one another because the intermolecular forces are too weak to hold the atoms or molecules in a solid form.

  3. Intermolecular Forces Forces of attraction between different molecules rather than bonding forces within the same molecule. • Dipole-dipole attraction • Hydrogen bonds • Dispersion forces

  4. Forces and Phases • Substances with very little intermolecular attraction exist as gases • Substances with strong intermolecular attraction exist as liquids • Substances with very strong intermolecular (or ionic) attraction exist as solids

  5. Phase Differences Solid– definite volume and shape; particles packed in fixed positions; particles are not free to move Liquid– definite volume but indefinite shape; particles close together but not in fixed positions; particles are free to move Gas– neither definite volume nor definite shape; particles are at great distances from one another; particles are free to move

  6. Three Phases of Matter

  7. Types of Solids • Crystalline Solids: highly regular arrangement of their components [table salt (NaCl), pyrite (FeS2)].

  8. Unit Cell The smallest portion of a crystal lattice that shows the three-dimensional pattern of the entire lattice

  9. Types of Solids • Amorphous solids: considerable disorder in their structures (glass and plastic).

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